Pulp molding machine



Dec. 29, 19M.

M.P.CHAEUN PULP MOLDING MACHI Filed March 14, 1928 INVENTOR //efle P [/70/91277 i BY A'I TORN S PatentedrDee. 29), r1.",3'1-

' imams r. enum, or vta vmLn, IA'mAssrNon, nYunsNn ASSIGNMENTS, 'ro

l, mm meer' come or ron'rLm,.ua`1NE, A coaronajrron'or nam rum nomme msnm pinceau ma mn 14, im. sei-1p1 iro. masa.

This invention relates to pulp molding machines.

More particularl stated the invention re-v lates m the :mnu acture of multi-layer articles in pulp molding machines.

. face, to utilizec-'a suitable material to lill in f die during the forming of t e layer of pulp l so or die face and another layer Aof (pulp is then i #provide an improved method of e a .molded videata meth In the forming or manufacture o'f-mu'ltif c 'layer articles it is sometimesdesirable, inorder to secure a chmpact and lmpervlous sur-v --tain amount of the filling material tobe retained inthe formedy articleand lodge be, `tween the bers'thereof. `However, a considerable4 Aamount of lthe filling material is carried completely through the formed article by thesuction'and is washed away in the lwater that is suclied lthrou h the forming o the die. This is particularly true when the {illlingmaterial is mixed with the pulp solution used to form a layer 4on the wire screen deposited onthrst layer# Uh cumstances deposited 1n passingl Tofpulpcarrie's wit of the filling material.

rqfuch cirthe water from. the solution last through the first layer With the above d'icultiesiin mind this.'

invention has for onel of its obctswto pro? vide a compact impervious mol ell-pulp article., .l

`Another ject of the inventionisvzto be IerIheating pulp article Y withdiaie yfdivide'd material.

, Another `ob'ect ofvtherinvention iste prood and means wherebyitlling or othl'er like material can bee-positioned or-located in the inside or unexposed portion of the-molded article.. T 'i g' "Further objects of the inrention will ap-A .to mix 'such fillings mate` it a considerable part pear fromthe following specification taken 1n connection with the drawings, which form a art of this application, and in which ig. 1 is an elevational view somewhat dia rammatic of a machine constructed in-ac` cor ance with the' invention and adapted to ca out the method; n

F1g. 2v is an enlarged sectional elevation showlng a plurality of dies and a portion ofthe vat; f f

IFi 3 is a sectional elevation taken substantlally on line 3-3 of Fi 2;

. Fig. I4 is a sectional elevatin'showing and(n articlelmade on the machine constructed in accordancewith the invention and by, the method hereinafter described and 5 Fig. 5 is a sectionalNelevation taken substantially on-lin 5,5 of Fig. 1.

kThe invention brieiy described consists ofr a method of and a machine for ,forming an article aving a deposit of filling material jdisp. d withinjthe' article between the front andl back surfaces thereof In the form of the invention illustratedthe method consists of forming a layer of pulp deposit on and permeating the'layerwith finely divided filling material and' then'y forming a `further layer of pulp [on the back of the filling material. By forming the article in this manner the filling material is not'sucked through the screen or' die face with the wal.l

ter and, furthermore, is not exposed since there 1s a layer of pulp on both sides thereof.

^ln the particular form of apparatus orf' machine illustrated. for carrying out the ymethod, -a vat is provided with compart "ments having different solutions therein and means is providediat a predetermined position in the vat forv so 'injecting the filling material that it ,will be deposited on the lay- Thefdies are mounted on a `carrier and are Amovable successively .through the different pulp /solut/ions and in the first ,compartment receive a layer of one character-of pulp, then moveto-thesecond compartment to receive another layer and also the filling material; and after receivingthe `filling'material the diesreceive, ay further layerof pulp.

ver bf pulp alreadydeposited `on .thel` die. A

loo

side the conduits and dies A and C. The die l faces of the 'dies 13 are perforated 'and throughthe hub 11 the arms 12 are connected toa suitable source of suction so that as the dies pass through the vat pulp is deposited thereon from the pulp solutions.

The carrier and dies are mounted above a vat 20 having `a partition 2l forming two compartments, X and Y. As shown in Fig. 2, the partition, 21 has extending laterally therefrom into the compartment X, a ledge or shelf 22 preferably lslightly curved /or arcuate to conform to the arcuate path of movement of the dies. If desired, the partition may also have formed thereon and disposed above the shelf, side walls 23 which with the shelf 22 form a ytrough through which the dies pass, the partition being provided with an opening above the shelf to per- .A 4mit the passage of the carrier and dies.

As the dies pass through tlie solution in the compartment X', a layer of pulp is deposited thereon, and since the trough formed by the Walls 23 and the shelf 22 enclose a comparatively limited amount of pulp solution substantially all of the pul solution in the trough is deposited on the dles, thus preventing its being carried with the dies and carrier into the compartment Y.

If desired, the compartment X may have one character of solution therein, such for instance asa high grade or light colored pulp, and the compartment Yqmay `have a coarseror darker grade of pulp.

Ther is positioned at a predetermined point i the compartment Y a shelf or ledge 30 having connected thereto conduits 31, 32 and 33 spaced a distance apart corresponding to the conduitsl A, B and C. The upper ends of the conduits are tapered, as shown in Fig. 2, at 35 to form nozzles.

VEach conduit communicates with a valve casing 36` having a pair of chambers 37 and 38 therein which are adapted to communicate with each other through a port 39. The communication through the port 39is lcontrolled by a valve 40 which in turn is controlled by a tappet lever or` rod 41. The

y levers 41 are controlled by cams 42 mounted on a cam shaft 43. y Each` chamber 37 has connected thereto a conduit 45 which in turn is'connected to a supply/ of suitable filling material and thisl material is preferably pumped under fpressure into the conduits 45. The cam sha t 43 is rotated at such a speed that the valves 40 will be `opened at the periods in the cycle of revolution of the carrier l() when a set of dies is positioned above the nozzles 35. It is obvious that the shelf,

conduits and nozzles can be located at any' desired point in the compartment Y or, `if desired, in another compartment, so that the filling material will be deposited on the die and layer of pulp thereon at any desired period in the'cycle of operation.

The `machine operates in the following manner. As the dies pass through the compartment X a layer of pulp from the solution therein is deposited on the dies. When the dies pass over the shelf 22 into compartment Y an intermixture of the pulp from the compartments X and Y willbe deposited thereon and then a small'amount of pulp from the compartment Y will be deposited. When the dies reach a position over thenozzles 35 the valves 40 will be opened and a mixture termined that suiicient layer of pulp will be` deposited on the dies prior to the depositing thereon of the filling material to prevent 'the filling material being sucked through the layer of pulp and through the die face with the water which is removed from the deposit by the suction.

It will be evident from the method and apparatus bove described that articlesformed there will have inner and outer layers of pulp and a depositof lling material posi-` tioned Ibetween and concealed by theinner and outer layers.

Although one specific embodimentof the invention has been particularl shown and described, it will be understoo that the 'invention iscapable of' modification and that changes/ in the construction and inthe ar-A rangement of the Ivarious cooperating parts may be madeI without departing from theI vat vof filling material will be deposited on the throughv said compartments, and means in one of said compartments for depositing finely divided filling material on said die and the pulp deposited thereon when the ldie reaches a predetermined position.

I 2. A pulp molding machine comprisinga Y carrier, a diemounted thereon, a pulp vat having a plurality of compartments, said die through said compartments, and means -in-v being movable successively by Mthe carrier through said compartments, and means 1n advanceo one of said compartments for depositing finely divided filling material on said die and the pulp deposited thereon when the die reaches a predetermined position.

3. A pulp molding machine comprisinga carrier, a' die mounted thereon, a pulp vat having a plurality of compartments, said die being movable successively by the carrier cluding a nozzle in one of said compartments fory depositing finely dividedfilling material lon said die and the pulp deposited .thereon predetermined posihaving a plurality of compartments, said diel being movable successively by the carrier. through said compartments, a ledge in one of said compartments disposed below and adjacent to the path of travel of said die, and means for injecting through said ledge vinely divided filling material whenvthe'die reaches a position opposite said ledge.

'6;.A pulp molding machine comprising a carrier, a plurality of sets of dies radia ly mounted on.`said carrier, the dies of each set being disposed side by sidev in alinement with each other, a tankhaving a ledgeI therein disposed below the path of travel of said dies, l andmeans for injectingthrough said shelf jets of lillin'g material. s

Y 7-. A pulp molding machine comprising a carrier, a plurality of Ysets of dies radially mounted onsaid carri-er, the dies of each set being disposed side byside in alinement with each other, a tank havin a'ledge therein dis? posed below' the 4path o travelof said dies,

v and means including nozzlesl disposed below the path of movement of the dies 'for inject ing through said shelfj ets of lillirng'material.

Y 8.y A pulp molding machine comprising ac through said nozzle.

rate of movement of the dies over said nozzle for controlling the passage of lilling material 10. A pulp moldin machine comprising a carrier a plurality o dies mounted thereon, a vat dlsposed below said carrier and adapted to receive said dies, a plurality of compartments in said vat for holding different pulp solutions, and means in one of said compart ments for injecting lilling material below the.

path of movement of said dies. A

11. A pulp moldin machine comprising a carrier, a plurality 0% dies mounted thereon, a vat disposed below said carrier and adapted to receive said dies, a plurality of compartments in said-vat for holding dill'erent pulp solutions, and valve controlled means in one of said compartments for injecting filling Vmaterial below the path of movementof said dies.

12. A continuous method of forming molded articles which consists of forming a layer of pulp of fibers of selected size, projectmg more linelydivided fibrous material on said layer and covering said deposit of more finely divided material with another layer of fibrous 13. A continuous method of forming molded articles which consists of successlvely pass-A ing forming dies through a plurality of pulp vsolutionscontaining bers of selected size,

thereby to form deposits of pulp on the dies,

projecting on and permeatmp one of said' fplulp deposits on the die, with a nely divided fibrous material, and covering said filling of more finely divided material lling of more .with a` deposit from another ofsaid pulp soluv-v p tions. 14. A continuous method offorming mold ed articles which consists of forming a layer `of pulp of bers of selected size, on aiorming die,`b`y the application of suction tothe pulp, projecting a more finel divided fibrous material on said layer, b t e application of' pressure to said divide material, independently of said application of suction, and covering the deposit of more nel divided material f with another' layer of rous pulp by the application of suction to the latter pulp.

In witness whereof, I have hereunto set my hand this thday of March, 19,28.

' MERLE P. CHAPLIN.

carrier, forming dies-mountedfthereoma nozzle disposed below the path of travel of said v v dies, and means synchronized'with the movement of said dies over saidpnozzle -for `directing a jet of lling material through/said nozzle. l f

9. A pulp molding machine comprising a carrier, forming dies mounted `thereon, av nozzle disposed below the lpath of travel of said dies, and valve means synchronized withthe 

